Emit tnum representation as just a constant if all bits are known.
Use decimal-vs-hex logic to determine exact format of emitted
constant value, just like it's done for register range values.
For that move tnum_strn() to kernel/bpf/log.c to reuse decimal-vs-hex
determination logic and constants.
Acked-by: Shung-Hsi Yu <shung-hsi.yu@xxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
---
kernel/bpf/log.c | 13 +++++++++++++
kernel/bpf/tnum.c | 6 ------
.../bpf/progs/verifier_direct_packet_access.c | 2 +-
.../testing/selftests/bpf/progs/verifier_int_ptr.c | 2 +-
.../selftests/bpf/progs/verifier_stack_ptr.c | 4 ++--
5 files changed, 17 insertions(+), 10 deletions(-)
diff --git a/kernel/bpf/log.c b/kernel/bpf/log.c
index 3505f3e5ae96..55d019f30e91 100644
--- a/kernel/bpf/log.c
+++ b/kernel/bpf/log.c
@@ -539,6 +539,19 @@ static void verbose_snum(struct bpf_verifier_env *env, s64 num)
verbose(env, "%#llx", num);
}
+int tnum_strn(char *str, size_t size, struct tnum a)
+{
+ /* print as a constant, if tnum is fully known */
+ if (a.mask == 0) {
+ if (is_unum_decimal(a.value))
+ return snprintf(str, size, "%llu", a.value);
+ else
+ return snprintf(str, size, "%#llx", a.value);
+ }
+ return snprintf(str, size, "(%#llx; %#llx)", a.value, a.mask);
+}
+EXPORT_SYMBOL_GPL(tnum_strn);
+
static void print_scalar_ranges(struct bpf_verifier_env *env,
const struct bpf_reg_state *reg,
const char **sep)
diff --git a/kernel/bpf/tnum.c b/kernel/bpf/tnum.c
index f4c91c9b27d7..9dbc31b25e3d 100644
--- a/kernel/bpf/tnum.c
+++ b/kernel/bpf/tnum.c
@@ -172,12 +172,6 @@ bool tnum_in(struct tnum a, struct tnum b)
return a.value == b.value;
}
-int tnum_strn(char *str, size_t size, struct tnum a)
-{
- return snprintf(str, size, "(%#llx; %#llx)", a.value, a.mask);
-}
-EXPORT_SYMBOL_GPL(tnum_strn);
-
int tnum_sbin(char *str, size_t size, struct tnum a)
{
size_t n;
diff --git a/tools/testing/selftests/bpf/progs/verifier_direct_packet_access.c b/tools/testing/selftests/bpf/progs/verifier_direct_packet_access.c
index 99a23dea8233..be95570ab382 100644
--- a/tools/testing/selftests/bpf/progs/verifier_direct_packet_access.c
+++ b/tools/testing/selftests/bpf/progs/verifier_direct_packet_access.c
@@ -411,7 +411,7 @@ l0_%=: r0 = 0; \
SEC("tc")
__description("direct packet access: test17 (pruning, alignment)")
-__failure __msg("misaligned packet access off 2+(0x0; 0x0)+15+-4 size 4")
+__failure __msg("misaligned packet access off 2+0+15+-4 size 4")
__flag(BPF_F_STRICT_ALIGNMENT)
__naked void packet_access_test17_pruning_alignment(void)
{
diff --git a/tools/testing/selftests/bpf/progs/verifier_int_ptr.c b/tools/testing/selftests/bpf/progs/verifier_int_ptr.c
index b054f9c48143..74d9cad469d9 100644
--- a/tools/testing/selftests/bpf/progs/verifier_int_ptr.c
+++ b/tools/testing/selftests/bpf/progs/verifier_int_ptr.c
@@ -67,7 +67,7 @@ __naked void ptr_to_long_half_uninitialized(void)
SEC("cgroup/sysctl")
__description("ARG_PTR_TO_LONG misaligned")
-__failure __msg("misaligned stack access off (0x0; 0x0)+-20+0 size 8")
+__failure __msg("misaligned stack access off 0+-20+0 size 8")
__naked void arg_ptr_to_long_misaligned(void)
{
asm volatile (" \
diff --git a/tools/testing/selftests/bpf/progs/verifier_stack_ptr.c b/tools/testing/selftests/bpf/progs/verifier_stack_ptr.c
index e0f77e3e7869..417c61cd4b19 100644
--- a/tools/testing/selftests/bpf/progs/verifier_stack_ptr.c
+++ b/tools/testing/selftests/bpf/progs/verifier_stack_ptr.c
@@ -37,7 +37,7 @@ __naked void ptr_to_stack_store_load(void)
SEC("socket")
__description("PTR_TO_STACK store/load - bad alignment on off")
-__failure __msg("misaligned stack access off (0x0; 0x0)+-8+2 size 8")
+__failure __msg("misaligned stack access off 0+-8+2 size 8")
__failure_unpriv
__naked void load_bad_alignment_on_off(void)
{
@@ -53,7 +53,7 @@ __naked void load_bad_alignment_on_off(void)
SEC("socket")
__description("PTR_TO_STACK store/load - bad alignment on reg")
-__failure __msg("misaligned stack access off (0x0; 0x0)+-10+8 size 8")
+__failure __msg("misaligned stack access off 0+-10+8 size 8")
__failure_unpriv
__naked void load_bad_alignment_on_reg(void)
{
--
2.34.1
